TCD sensor senses the TDC sensor(Camshaft Position Sensor) point of ON.1, 4 cylinder on its compression stroke. Its signal is fed to ECM to be used to determine the sequence of fuel injection. Crank angular sensor senses the crank angular of each cylinder, and input the pulse signal to ECM. Its signal is fed to ECM to be used to determine the engine speed and adjust the fuel injection timing and ignition timing.

Refer to P0341, P0343 DTC inspection procedures.